model.actuator_ctrlrange.copy().astype(np.float32)
https://github.com/openai/mujoco-py/blob/master/examples/body_interaction.py#L54
https://github.com/openai/mujoco-py/blob/master/mujoco_py/generated/wrappers.pxi#L736
https://github.com/openai/mujoco-py/blob/master/mujoco_py/generated/wrappers.pxi#L1778
https://github.com/openai/mujoco-py/blob/master/mujoco_py/generated/wrappers.pxi#L2479